Systematic Tuning of the Luminescent Properties of Self-Activated ZnGa2O4 Phosphors by Cd Ion Substitution

✍ Scribed by Teng-Ming Chen; Y.-W. Chen

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 184 KB
• Volume: 150
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8585

✦ Synopsis

The e4ect of host compositions on the luminescent properties of spinel-type ZnGa 2 O 4 phosphors was investigated by systematic substitution of Cd 2؉ for Zn 2؉ in the host lattice. A continuous solid solution with the composition (Zn 1؊x Cd x )Ga 2 O 4 (04x41.0) was synthesized at 9503C as self-activated phosphors, as indicated by X-ray di4raction (XRD) analysis. With increasing substitution of Cd 2؉ the emission and excitation wavelengths ( em and exc ) of self-activated (Zn 1؊x Cd x )Ga 2 O 4 were observed to exhibit a red shift, as indicated by photoluminescence spectral analysis. Similar results were also con-5rmed by cathodoluminescence data. Our observations are attributed to the systematic narrowing of the energy gap of the host attributed to expanding lattice dimensions induced by Cd 2؉ substitution. A CIE chromaticity diagram manifests the e4ect of Cd 2؉ doping on variation of hue for the (Zn 1؊x Cd x )Ga 2 O 4 gallate phosphors.